Age-dependent TLR3 expression of the intestinal epithelium contributes to rotavirus susceptibility.

PLoS Pathogens
Johanna PottMathias W Hornef

Abstract

Rotavirus is a major cause of diarrhea worldwide and exhibits a pronounced small intestinal epithelial cell (IEC) tropism. Both human infants and neonatal mice are highly susceptible, whereas adult individuals remain asymptomatic and shed only low numbers of viral particles. Here we investigated age-dependent mechanisms of the intestinal epithelial innate immune response to rotavirus infection in an oral mouse infection model. Expression of the innate immune receptor for viral dsRNA, Toll-like receptor (Tlr) 3 was low in the epithelium of suckling mice but strongly increased during the postnatal period inversely correlating with rotavirus susceptibility, viral shedding and histological damage. Adult mice deficient in Tlr3 (Tlr3(-/-)) or the adaptor molecule Trif (Trif(Lps2/Lps2)) exerted significantly higher viral shedding and decreased epithelial expression of proinflammatory and antiviral genes as compared to wild-type animals. In contrast, neonatal mice deficient in Tlr3 or Trif did not display impaired cell stimulation or enhanced rotavirus susceptibility. Using chimeric mice, a major contribution of the non-hematopoietic cell compartment in the Trif-mediated antiviral host response was detected in adult animals. Finally, a...Continue Reading

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Datasets Mentioned

BETA
GSE35596
GSE35597

Methods Mentioned

BETA
biopsies
IECs
ELISA
PCR
IEC
density gradient centrifugation
FACS

Software Mentioned

Feature Extraction Software

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